Polyazo dyes



United States Patent This invention relates to a process for the production of polyazo dyes of the formula A represents the radical of a diazo component of the hydroxyaminonaphthalene sulfonic acid series,

B the radical of a diazo component which may contain azo bridges, and

X hydrogen or a sulfonic acid group.

The process of the invention comprises reacting 1 mole of a diazotized hydroxyaminonaphthalene sulionic acid with 1 mole of a compound or" the formula and subsequently with 1 mole of any desired diazo component, e.g., diazo components of the benzene, diphenyl and naphthalene series.

The preferred dyes are those which are obtained when the coupling product of 1 mole of diazotized dehydrothiotoluidine sulfonic acid and 1 mole of 1,3-dihydroxybenzene is reacted with 1 mole of diazotized l-amino- 8-hydroXynaphthalene-3,6-disultonic acid and the resulting product converted with 1 mole of a substituted diazotized aminonitrobenzene, preferably l-aminol-nitrobenzene, into the final dye.

A compound of Formula II is reacted preferably with a hydroxyaminonaphthalene :sulfonic acid at pH values between 7.5 and 11, or preferably pH 8.5-9, and at temperatures of 0 to C. in an aqueous medium.

An organic solvent, e.g., pyridine, can be added to the reaction medium. The products thus obtained can be coupled with a further diazo component of any desired type in aqueous medium at temperatures from 0 to 30 C. and pH values from 4.5 to 11, if necessary with the addition of an organic solvent such as pyridine.

The dyes obtained are used for the dyeing and printing 3 ,179,659 Patented Apr. 20, 1965 of leather and give brilliant yellowish or-reddishshades of medium to dark brown.

The dyes have very good level dyeing properties, give consistent shades on leather of varying degrees of tannages, and have good building-up properties in neutral to weakly acid dyebaths, excellent solubility in water, very good stability to acids and alkalis, good buffing fastness on chrome suede leather, very good migration fastness on polyvinyl chloride and rubber crepe, very good fastness to formaldehyde, very good hot pressing fastness and good light fastness.

In the following examples the parts and percentages are by Weight and the temperatures in degrees centigrade.

Example 1 p 338 parts (1 mole) of dehydrothiotoluidine monosulfonic acid are diazotized in the usual manner with 69 parts of sodium nitrite in hydrochloric acid solution, and then coupled in soda-alkaline solution with parts (1 mole) of 1,3-dihydroxybenzene to give the basic scheme of the monoazo compound of Formula II.

319 parts (1 mole) of 1-amino-8-hydroxynaphthalene- 3,6-disulfonic acid are diazotized in the normal way with 69 parts of sodium nitrite in hydrochloric acid solution, and coupled in soda-alkaline solution with the monoazo compound of Formula II, preferably in the 3-position of the resorcin nucleus. The product is coupled in acetic acid medium with the diazo compound of 138 parts (1 mole) of 1-amino-4-nitrobenzene, preferably in the 5-position of the resorcin nucleus, and the final dye salted out with common salt. The dye is a brown powder readily soluble in water, which dyes leather in medium yellow-brown shade of excellent levelness. V I

The dye has very good level-dyeing properties, gives a consistent shade on leathers of varying tannages, has good building-up properties in neutral and weakly acid dyebaths, excellent solubility in water, very good stability to acids and alkalis, good bufiing fastness on chrome suede leather, very good migration fastness on polyvinyl chloride and rubber crepe, very good formaldehyde fastness,

very good hot pressing fastness, and good light fastness.

Example 2 The diazo compound of 319 parts (1 mole) of 1- amino- 8-hydroXynaphthalene-3,6-disulfonic acid is coupled in soda-alkaline solution with the monoazo compound of Formula II, preferably in the 3-position of the resorcin nucleus. The resulting disazo dye is coupled in the 5- position of the resorcin nucleus and/or the 7-position of the l-azo-8-hydroXynaphthalene-3,o-disulfonic acid in soda-alkaline solution with the diazotized monoazo dye obtained by diazotization of 173 parts (1 mole) of lannnobenzenel-sulfonic acid and coupling in acetic acid solution with 223 parts (1 mole) of l-aminonaphthalene- 6- or -(7)sulfonic acid.

The solution of the final dye is rendered acid to Congo paper and the dye precipitated with common salt and dried. It is obtained as a brown powder which dissolves in water to give red-brown solutions and dyes leather in dark red-brown shades of very good all-round fastness.

In the following table further dyes are enumerated which can be produced according to the procedures described in Examples 1. and 2. In column A the basic scheme of the dyes of Formula II is given and in columns B and C the further components which are suitable for the synthesis of dyes of Formula I. In column D is noted the shade of the dyeing on leather.

Example 24 The diazo compound of 319 parts (1 mole) of 1- amino-8-l1ydroXynaphthalene-3,6-disulfonic acid is coupled in soda-alkaline solution with the monoazo compound of Formula ll, preerably in the 3-position of the resorcin nucleus. The resulting disazo dye is coupled in r yellow-brown shades of very good all-round fastness.

Dyeing Example A 100 parts of freshly tanned and neutralized chrome grain leather are entered into a dyebath of 250 parts of water at 65 and 1 part of the dye obtained as described in Example 1. The leather is drummed for 30 minutes, then 2 parts of an anionic fat liquor based on sulfonated train oil are added, and drumming continued for 30 minutes. The leather is dried and finished in the normal way. It is dyed a very level shade of medium yellow- 7 brown.

Dyeing Example B 109 parts of calf suede leather are Wetted back in the a, wasso .1, a Example No. A B C D 3 Dchytrothiotoluidinc sull-amino-8-hydroxynaphtha 1-amiuo-d-nitrobcnzcne- Yellow-brown.

ionic acid- 1, 3-dihylone-3, G-disnlfonic acid. fi-sulionic acid. droxy-benzcnc. 4. rlo 1 (4-aminobcnzoylamino)- do Brown.

S-hydroxynaphthalcneii, (i-disulfonic acid.

5.. do l-nmino-i-nitro-2-chloro- Yellow-brown.

benzene.

'6 do l-aminc-s-hydroxynaphthal-amino 3-nitrobcnzene Do.

lene i, G-disulfonic acid.

7 -J 2-1rninoiihyclroxynaphthal-amino--nitro-Z, 6-di- Brown.

lcneG-sulfouic acid. chlorobenzenc.

8 d Z-aminah-hydroxynaphtha- 1-aminobenzene-st-sulfonic D0.

lcnc-7-snlf0nic acid. acid.

9. d0 l-amino-8-hydr0xynapllthal-aminol-methoxy- Do.

lone-3, d-disulionic acid. benzene.

10 do do l-arnino-Z-methoxy- Do.

benzene.

11 do do l l-aminodmethoxy-ben- D0.

zene-5-sulfcnio acid.

12. .d0 d0 l-amino-l-nitro-Z-mcthoxy- Red-brown.

benzene.

1? do do 1-amino-2-mcthoxy3-nitros- Brown.

fi-chlorobcnzenc.

. do do -aminoy-nitro-cliphenyl- Red-brown.

amine-2-sulfonic acid.

do do p-Amino-azcbonzcnc Brown.

do "do p-Amino-azobcuzcne- Do.

monosulionic acid.

17. do. do p-Amino-azobcnzcne- Do.

- disulfonic acid.

18 .d0 do M01 0 compound 01': 1- Dark redam.nobenzeno-d-sulfonlc brown. acid and l-aminonaphthaleno-G-sulfonic acid.

19 d0 do Monoazo compound of: 1- Red-brown.

aminobenzenci-sulionic acid and 1-amino-2- mcthylbenzene.

20 do do Monoazo compound of: 4- Dark redamino-4-nitrodiphenylbrown. amlne-2-sulf0nic acid and l-amino-2, 5-diand Lemme-2, 5-dimcthylbenzene.

2i do do Monoazo compound of: 1- Brown.

aniino-4-nitrcbenzene-6- sulfonic acid and l-amino- Z-methoxybcnzene.

22 do do Monoazo compound 01': L Red-brown.

ainino-2-mcthoxy-4- nitrobcnzene and 1- amino-3-methyl-6- methoxybenzene.

23- d do 1-amino4-nitro-2- Ycllowrowu.

chlorobcnzcne.

23a dchydrothiotoluidiuc-dido p-Aminoazobenzcne-disul- Brown.

sulfonic acid- 1.3- ionic acid. dihydroxy-benzcne.

drum for 4 hours with 1000 parts of Water and 2 parts of ammonia. The leather is then dyed for 1 /2 hours in the drum from a bath prepared with 500 parts of water at 65, 2 parts of ammonia and 10 parts of the dissolved dye described in Example 2. Subsequently, 4 parts of 85% formic acid are slowly added to exhaust the bath and dyeing continued until complete fixation of the dye. The suede leather is rinsed, dried and finished in the usual manner, and rebuffed. It is dyed in a very level red-brown shade. V

Dyeing Example C 1 00 parts or" chrome lambskin, are drum dyed for minutes from a bath of 1000 parts of water at containing 10 parts of the dye produced according to Example 3 and 1.5 parts of an anionic sperm oil emulsion. 5 parts of formic acid are slowly added over 30 minutes to bring about fixation of the dyein After drying and finishing, a leather dyed in a dark yelloW brown shade or" good levelness is obtained.

Dyeing Example D a? e a Formula of the representative dyestuffs of the foreof chloro, dichloro, nitro, lower alkoxy, lower alkyl, going examples are as follows: di-lower alkyl, sulfonic acid, nitro-sulfo-phenylamino,

Example 1:

so r:

Example 2:

s HgC- 803E S0311 S0 11 Example 24:

SIO H N OH N=NC C-ON=N* -o11 1ao- I rnosoarr s SOaH 503E SO3H Example 16:

S|O3H G--N=N 5 OH no- V 11 0- S SOaH E Example 23:

. S|O3H a c i C N=N um Ho H36 Having thus disclosed the invention what we claim is: phenylazo, sulfo phenylazo, (nitro-sulfo-phenyl- 1. A polyazo dye of the formula amino)-phenylazo, nitro-sulfo-phenylazo, lower al- /N X (H-I GC N=N 2 OH T N=N-B H O i 1 s R so r;

wherein koxy-nitro phenylazo, and of (b) a radical of the 1- A is the radical of adiazo component selected from amino-naphthalene-monosulfonic acid series bearing the group consisting of l-amino-S-hydroxynapha substituent selected from the group consisting of thalene 3,6 disulfonic acid, 1 (4-aminobenzoylsu1fo-phenylazo and (nitro-sulfo-phenylamino)-phenamino) S-hydroxynaphtha-S,-disulfonic acid, 1- azo, amino-8-hydroxynaphthalene-4,6-disulfonic acid, 2- and X is a member selected from the group consisting amino-8-hydroxynaphthalene-6-sulfonic acid and 2- of hydrogen and a sulfonic acid group, amino-S-hydroxynaphthalene-7-sulfonic acid, the -N=NB group being attached in one of the B is a diazo component radical selected from the group positions selected from the group consisting of posiconsisting of (a) a radical of the benzene series beartion 5 of the resorcin nucleus and position 7 of the ing a suhstituent selected from the group consisting 1-azo-8-hydroxynaphthalene sulfonic acid nucleus.

7. The polyazo dye of the formula OnN- NH 8. The polyazo dye of the formula 9. The polyazo dye of the formula 0 H N:N--

N SOBH References Cited by the Examiner UNITED STATES PATENTS Re. 22,046 3/42 Fellmer 260-158 x 1,667,327 4/28 Mayer 260-158 CHARLES B. PARKER, Primary Examiner. 

1. A POLYAZO DYE OF THE FORMULA 